Update python-bioext to 0.21.7

[BiocondaBot]

Update python-bioext: 0.21.2 → 0.21.7

Info	Link or Description
Recipe	recipes/python-bioext (click to view/edit other files)
Summary	A few handy bioinformatics tools not already in BioPython
Home	https://github.com/veg/BioExt.git
Releases	https://pypi.org/pypi/bioext/json

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